using MeetingAssistant.Summary;
using MeetingAssistant.Speakers;
using Microsoft.Extensions.AI;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Options;

namespace MeetingAssistant.Workflow;

#pragma warning disable MAAI001
public sealed class WorkflowRulesEditorChatPipeline : IWorkflowRulesEditorChatPipeline
{
    private readonly MeetingAssistantOptions options;
    private readonly ILoggerFactory loggerFactory;
    private readonly ILogger<WorkflowRulesEditorChatPipeline> logger;
    private readonly IWorkflowRulesEditorInstructionBuilder instructionBuilder;
    private readonly IDbContextFactory<SpeakerIdentityDbContext> speakerIdentityDbContextFactory;
    private readonly IWorkflowRulesEditorSamplePlaybackQueue samplePlaybackQueue;

    public WorkflowRulesEditorChatPipeline(
        IOptions<MeetingAssistantOptions> options,
        ILoggerFactory loggerFactory,
        ILogger<WorkflowRulesEditorChatPipeline> logger,
        IWorkflowRulesEditorInstructionBuilder instructionBuilder,
        IDbContextFactory<SpeakerIdentityDbContext> speakerIdentityDbContextFactory,
        IWorkflowRulesEditorSamplePlaybackQueue samplePlaybackQueue)
    {
        this.options = options.Value;
        this.loggerFactory = loggerFactory;
        this.logger = logger;
        this.instructionBuilder = instructionBuilder;
        this.speakerIdentityDbContextFactory = speakerIdentityDbContextFactory;
        this.samplePlaybackQueue = samplePlaybackQueue;
    }

    public async Task<WorkflowRulesEditorChatResult> SendAsync(
        IReadOnlyList<WorkflowRulesEditorChatMessage> conversation,
        string userMessage,
        CancellationToken cancellationToken)
    {
        if (string.IsNullOrWhiteSpace(userMessage))
        {
            return new WorkflowRulesEditorChatResult("", conversation);
        }

        var agentOptions = options.WorkflowRulesEditor.ToEffectiveAgentOptions(options.Agent);
        var key = ResolveApiKey(agentOptions, "workflow rules editor");
        var tools = new WorkflowRulesEditorTools(
            options,
            speakerIdentityDbContextFactory,
            samplePlaybackQueue);
        var messages = conversation
            .Select(ToChatMessage)
            .Append(new ChatMessage(ChatRole.User, userMessage.Trim()))
            .ToList();
        var instructions = await instructionBuilder.BuildAsync(options, cancellationToken);

        using var compactionSummaryClient = new LiteLlmResponsesChatClient(
            new Uri(agentOptions.Endpoint),
            key,
            agentOptions.Model,
            agentOptions.EnableThinking,
            ToReasoningEffortValue(agentOptions.ReasoningEffort),
            agentOptions.ReconnectionAttempts,
            agentOptions.ReconnectionDelay,
            compactionOptions: null,
            logger,
            firstRequestIsUser: false);
        var compactionOptions = CreateCompactionOptions(agentOptions, compactionSummaryClient);
        using var chatClient = new LiteLlmResponsesChatClient(
            new Uri(agentOptions.Endpoint),
            key,
            agentOptions.Model,
            agentOptions.EnableThinking,
            ToReasoningEffortValue(agentOptions.ReasoningEffort),
            agentOptions.ReconnectionAttempts,
            agentOptions.ReconnectionDelay,
            compactionOptions,
            logger,
            firstRequestIsUser: true);
        var functionClient = chatClient
            .AsBuilder()
            .UseFunctionInvocation(loggerFactory)
            .Build();

        var response = await functionClient.GetResponseAsync(
            messages,
            CreateChatOptions(agentOptions, tools, instructions),
            cancellationToken);
        var responseText = string.IsNullOrWhiteSpace(response.Text)
            ? "(No response text returned.)"
            : response.Text.Trim();
        var nextConversation = conversation
            .Append(new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.User, userMessage.Trim()))
            .Append(new WorkflowRulesEditorChatMessage(WorkflowRulesEditorChatRole.Agent, responseText))
            .ToList();
        return new WorkflowRulesEditorChatResult(responseText, nextConversation);
    }

    private static ChatMessage ToChatMessage(WorkflowRulesEditorChatMessage message)
    {
        return new ChatMessage(
            message.Role == WorkflowRulesEditorChatRole.Agent ? ChatRole.Assistant : ChatRole.User,
            message.Content);
    }

    private static ChatOptions CreateChatOptions(
        AgentOptions options,
        WorkflowRulesEditorTools tools,
        string instructions)
    {
        return new ChatOptions
        {
            ModelId = options.Model,
            Instructions = instructions,
            MaxOutputTokens = options.MaxOutputTokens,
            AllowMultipleToolCalls = true,
            ToolMode = ChatToolMode.Auto,
            Tools =
            [
                AIFunctionFactory.Create(
                    tools.ReadRules,
                    "read_rules",
                    "Read the configured workflow rules YAML file. With no line arguments, read the whole file. With from and to, read that clamped inclusive 1-based line range. With tail, read the last lines."),
                AIFunctionFactory.Create(
                    tools.WriteRules,
                    "write_rules",
                    "Append to the configured workflow rules YAML file by default after validating that the complete file parses as a workflow rules document. Set replace_file=true only when intentionally replacing the whole rules file."),
                AIFunctionFactory.Create(
                    tools.Search,
                    "search",
                    "Search the configured workflow rules YAML file using ripgrep-style syntax. The search is scoped to this single file and supports an optional file_pattern glob."),
                AIFunctionFactory.Create(
                    tools.ReadConfig,
                    "read_config",
                    "Read the local appsettings JSON configuration file. With no line arguments, read the whole file. With from and to, read that clamped inclusive 1-based line range. With tail, read the last lines."),
                AIFunctionFactory.Create(
                    tools.WriteConfig,
                    "write_config",
                    "Replace the local appsettings JSON configuration file after validating that the supplied content is valid JSON. Configuration stores environment variable names, not secret values."),
                AIFunctionFactory.Create(
                    tools.ReadConfigDocs,
                    "read_config_docs",
                    "Read Meeting Assistant configuration documentation from docs/meeting-assistant-configuration.md. Supports from/to or tail. Use this before explaining or changing unfamiliar configuration settings."),
                AIFunctionFactory.Create(
                    tools.ReadLogs,
                    "read_logs",
                    "Read the application-owned log files from the temp log folder. Defaults to tailing the current log. Set logFile to meeting-assistant.log.1 through .4 for rotated files, or supply from/to for a clamped 1-based line range."),
                AIFunctionFactory.Create(
                    tools.SearchLogs,
                    "search_logs",
                    "Search current and rotated application-owned log files with .NET regular expression syntax. Supports an optional file_pattern glob and returns filename:line text matches."),
                AIFunctionFactory.Create(
                    tools.SearchSpec,
                    "search_spec",
                    "Search copied OpenSpec specification markdown files with .NET regular expression syntax. Use file_pattern to limit searched files by glob. Returns relative/path.md:line text matches scoped to openspec/specs."),
                AIFunctionFactory.Create(
                    tools.ReadSpecFile,
                    "read_spec_file",
                    "Read one copied OpenSpec specification markdown file by path relative to openspec/specs. Supports from/to or tail."),
                AIFunctionFactory.Create(
                    tools.CreateProject,
                    "create_project",
                    "Create a new project folder under the configured projects folder. Use seed=recommended for PROJECT.md, JOURNAL.md, DECISIONS.md, and AGENTS.md from Project-AGENTS.md; seed=agents_md with agents_md to write AGENTS.md directly; or seed=none for an empty folder."),
                AIFunctionFactory.Create(
                    tools.ListProjects,
                    "list_projects",
                    "List all existing project folders under the configured projects folder."),
                AIFunctionFactory.Create(
                    tools.ListProjectFiles,
                    "list_projectfiles",
                    "List files inside an existing project folder."),
                AIFunctionFactory.Create(
                    tools.ReadProjectFile,
                    "read_projectfile",
                    "Read a file inside an existing project folder. With no line arguments, read the whole file. With from/to, read that clamped inclusive 1-based line range. With tail, read the last lines."),
                AIFunctionFactory.Create(
                    tools.WriteProjectFile,
                    "write_projectfile",
                    "Create or update a file inside an existing project folder. Appends by default, supports from/to replacement, insert, and replace_file for whole-file replacement."),
                AIFunctionFactory.Create(
                    tools.SearchProjects,
                    "search_projects",
                    "Search files in all existing projects with .NET regular expression syntax. Use file_pattern to limit searched files by glob, for example *.md or **/*.md."),
                AIFunctionFactory.Create(
                    tools.SearchIdentities,
                    "search_identities",
                    "Search or list speaker identities. Optional query matches canonical names, aliases, and candidate names. Returns JSON summaries."),
                AIFunctionFactory.Create(
                    tools.ReadIdentity,
                    "read_identity",
                    "Read one speaker identity by numeric identity id, including aliases, candidate names, references, and sample metadata."),
                AIFunctionFactory.Create(
                    tools.CreateIdentity,
                    "create_identity",
                    "Create a speaker identity with optional canonicalName, aliases, and candidateNames. Returns the created identity JSON."),
                AIFunctionFactory.Create(
                    tools.UpdateIdentity,
                    "update_identity",
                    "Replace a speaker identity's canonicalName, aliases, and candidateNames by numeric identity id. Omitted aliases/candidateNames become empty."),
                AIFunctionFactory.Create(
                    tools.DeleteIdentity,
                    "delete_identity",
                    "Delete a speaker identity and all linked aliases, candidate names, references, and samples by numeric identity id."),
                AIFunctionFactory.Create(
                    tools.MergeIdentities,
                    "merge_identities",
                    "Merge sourceIdentityId into targetIdentityId, preserving target canonical name, adding source names as aliases, moving references and samples, then deleting the source."),
                AIFunctionFactory.Create(
                    tools.ListIdentitySamples,
                    "list_identity_samples",
                    "List audio samples for a speaker identity by numeric identity id. Returns sample ids and metadata, not audio bytes."),
                AIFunctionFactory.Create(
                    tools.ReadIdentitySample,
                    "read_identity_sample",
                    "Read one audio sample by numeric sample id. Returns metadata and base64 WAV bytes."),
                AIFunctionFactory.Create(
                    tools.DeleteIdentitySample,
                    "delete_identity_sample",
                    "Delete one audio sample by numeric sample id."),
                AIFunctionFactory.Create(
                    tools.QueuePlayIdentitySample,
                    "queue_play_identity_sample",
                    "Queue one audio sample by numeric sample id for local playback. This is asynchronous and does not block until playback finishes.")
            ],
            Reasoning = options.EnableThinking
                ? new ReasoningOptions { Effort = ToReasoningEffort(options.ReasoningEffort) }
                : null
        };
    }

    private static LiteLlmResponsesCompactionOptions CreateCompactionOptions(
        AgentOptions options,
        IChatClient? summaryClient)
    {
        return new LiteLlmResponsesCompactionOptions
        {
            Enabled = options.EnableCompaction,
            ContextWindowTokens = options.ContextWindowTokens,
            MaxOutputTokens = options.MaxOutputTokens,
            RemainingRatio = options.CompactionRemainingRatio,
            CompactPath = options.ResponsesCompactPath,
            FallbackStrategy = OpenAiMeetingSummaryAgentPipeline.CreateFallbackCompactionStrategyForTests(
                options.ContextWindowTokens,
                options.MaxOutputTokens,
                options.CompactionRemainingRatio,
                summaryClient)
        };
    }

    private static string ResolveApiKey(AgentOptions options, string agentName)
    {
        if (!string.IsNullOrWhiteSpace(options.Key))
        {
            return options.Key;
        }

        var value = Environment.GetEnvironmentVariable(options.KeyEnv);
        if (!string.IsNullOrWhiteSpace(value))
        {
            return value;
        }

        throw new InvalidOperationException(
            $"No {agentName} API key configured. Set MeetingAssistant:WorkflowRulesEditor:Key, MeetingAssistant:Agent:Key, or environment variable '{options.KeyEnv}'.");
    }

    private static string ToReasoningEffortValue(ReasoningEffortOption effort)
    {
        return effort switch
        {
            ReasoningEffortOption.None => "none",
            ReasoningEffortOption.Low => "low",
            ReasoningEffortOption.High => "high",
            ReasoningEffortOption.ExtraHigh => "xhigh",
            _ => "medium"
        };
    }

    private static ReasoningEffort ToReasoningEffort(ReasoningEffortOption effort)
    {
        return effort switch
        {
            ReasoningEffortOption.None => ReasoningEffort.None,
            ReasoningEffortOption.Low => ReasoningEffort.Low,
            ReasoningEffortOption.High => ReasoningEffort.High,
            ReasoningEffortOption.ExtraHigh => ReasoningEffort.ExtraHigh,
            _ => ReasoningEffort.Medium
        };
    }
}
#pragma warning restore MAAI001